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A poseur is someone who poses for effect, or behaves affectedly, who affects a particular attitude, character or manner to impress others, or who pretends to belong to a particular group. A poseur may be a person who pretends to be what they are not or an insincere person; they may have a flair for drama or behave as if they are onstage in daily life.
"Poseur" or "poseuse" is also used to mean a person who poses for a visual artist—a model.